Roll for cane mills, crushers, and the like



D.YMILNE ROLL FOR CANE MILLS, CRUSHEHS, AND THE LIKE AJan. 29, 1929.

Filed Sept. 14, 1925 Patented Jan. ze, i929. Y

nAvIDiviiLNE, oF Artsonia, coimncmic'ufr, Assienon, examens Assieiiiaeirrs, To i FARREL-BIRIVIINGHM COMPANY, IKNCGPi-GBATED, OF

CORPORATION OF CONNECTCUT.-

Artsonia, coiiiincricufi, A

ROLL Fon CANE MILLS, cnusiiiins, Annarita LiKE.

Application led September 14, 1925. Serial Noffif.y

This invention relates to vrolls particularly adapted for use in juice expressing cane millsv or Crushers, which arevoften used in advance of such4 mills. It may also be noted that'my improvements are not necessarily limited to rolls for use in this relation only, but are l a pair of such rolls will not have, to as great,

a degree as is desirable, the property of bit-l applicablev to rolls of yother typeV wherein it is desired to improve the capacity oftwo or more cooperating yrolls to draw into the bite between them'the material to be acted upon.

manufactured and incorporated in a machine, the surface ofthe rolls'is usually7 more or less smooth, and for a this reason there is inclined to be a slippage between them and the material upon which they are vacting or which passes therebetween. In other words,

ing into or taking hold of the material to be acted upon and drawing it into the roll f bite.V V

This is true of the rolls used in cane mills vat i the present time, notwithstanding the'fact that such rolls are usually provided with a;

series of alternate peripheral grooves and ridges, the rolls being ,usually soplacedY that the rib or ridge of one roll will lenter to f .some extent the groove inthe cooperating roll.

As a result when new rolls are installed in a Crusher or in a three-roll mill, it is common practice to open up the-rolls until their sur.-

y faces have 4been'roughened lor pitted by Vthe action of the juice or cane passing therethrough. y Therolls can thenbe closed down to theirnormal positions `where they will operate 'with the greatest .efficiency and at highe'strcapacity Thetime required for this roughening process by the action ofthe cane juice-,is from one to two weeks, and in the meantime, a considerable loss in the operation ofthe mill results, as during this time, the vmill will not, of course, have operated at its ;v greatest efficiency. f One object of my invention, therefore,jis the provision of a roll for cane mills, crushers or thelike, having its surface so scored or Toughened that itwill bite into, and draw 1 '.-intofthe roll `bite,the cane or material to be acted' upon, without substantial` slippage.

Y Another object of my invention is to pro vide rolls for cane mills orthe like', such that when such rolls are new and are first ini jstalled the rolls of the mill may be'lltauy .v pressions.

A still fur-ther object'of invention is the provision of a pre-p'ittedtor pre-scored`roll for canemills, Crushers orthe'like having reg-` ularly and uniformly arrangedfpits orv de- Anotherrvobject is to provide a sugarcane roll having its surface pressed inzor dented at lVhen rolls of this vcharacter are newly.y

regular kintervals on the V-shaped ribs there-v v Vof so as to produce efficiently acting pits or depressions for gripping vthe cane. k

of parts to be hereinafter described and,

claimed. i v

In the accompanying drawings "2 Fig. 1 is aldiagrammatic view o f a common form of cane millinstallation;

bodying my inventiong;v

F ig.13 's a fragmentary enlarged elevationf al viewof a portion vof the surface of the-roll,

and

Fig. 4-is aA sectional on line of In Fig. 1 of the drawings, I'liave shown a l cane mill installation embodyingtwo pairs of Crusher rollsw10 andll, and three setsof three-roll cane mills 12,13 and 14.v It will be noted that the rolls of both the Crushers and the three-roll mills are4 provided with peripheral grooves and ridges, the rolls being so"v Varranged relatively. to each other that linsome instances, and especially ,in the caseajof the three-roll mills, the ridges of oneroll .willg l enter to .some extent the grooves of a coopery -ating roll. The'arrang'ement shown,is Amerel-1v ly V,by "way of example,l however,r and is deemed to be a conventional form of canemill installation, and it isnot to be inferredgthat j c t my invention isnecessarily,restrictedI to rolls used inthe precise combination shown. l.'

-Myimprovedrroll shown at .15, inlfig.V ff

may beused either in the preliminary 'crush-V ers or in the three-roll mills, and asprevious-- ripheral grooves 16, between which are ridges lys'tated, may also be used inother relations i v, where rolls of this character are desired'.l .e The roll is provided with a number ofpeU Y 17,fthe ridges as well'` as the grooves being lsubstantially V-shaped in cross section sothat the apex .of a ridge 'on one roll may enter a.

tendency for them to slip over thercane stalks instead of drawing such stalks into the roll 1site, due -to theirsmoothsurfaces.' As hasv already been-stated, this results in a loss oi' e'iicieiicyiwhen -new rolls are used until suoli rolls become suiiiciently roughened so that` theyrbite into the cane: to asuiiicient extent to exert a drawing or pulling action thereon.

The rolls constructed according to my in-A vention; arev provided with ahnumber of scores or pits 18 inthe form of recesses formedinuthe walls of thegrooves and ridges While .these` recesses or pits may be varied considerably in form, .they are according. 'toL Athe preferred embodiment illus trated and shown' especially in Fig. et, of substantially hour-glass.- shape, having enlarged oriiaringend portionsrlly and 20, and

n restricted intermedia-te por-.tions 2l. The pits are elongated in shape and extend substantiallyover thebentire wall .22 'of the grooveA Aand especially tothe apex y23 of the ridges, p' as shown in vFig.f3,the upper ends of these pits intersectingV the ridges, the resultbeing that the ridge presents a sinuous or'wavy outline.` While as -stated,l.these pits extend subsantially over, the Y greater part of. the

wall of the groove, they may terminate ya shortldistance-rfrom the bottom'thereof, as

shownfin"` Fig. t.

As shown, these-pitsare formed substan- YVtially radially of theA axis ofthe roll, and

while the twol correspondingpits on the op'-V posed vwalls 'of'each Ygroove are set substantiallyopposite eachother, they are preferably staggered with the pits of the'adjacent grooves so that Vthe pits'upon one side of each of the 'ridges are staggered' with those-formed onvthle otherfside thereof. Y Y

, The 'pits are referably formed in thelsurface *of the rolll by-a mechanical process so that they may bemade with a' degree of evenness and regularity and may befstaggered on opposite sides; ofthe ridges, as explained, al-

thoughl'itwi'll be understood that the location of these pits-may be lvaried as well as their shape or number, without departing from the principleofthe invention; The pits will not interfere inl anyway with lthe operation of` thev roll Scrapers, so that the result is that with rolls embodying my invention there is a positive feedoffthe cane thereto without appreciable slippage, and a mill mayy be used to capacity immediately that a new roll is installed, thus representing a great saving over the prior practice when-:the operation of the mill was required for aweekorniore with the rolls opened up beforefthey could be closed down, and operated at capacity load.

As shown in Fig. 3, when the pits upon one side of a ridge intersect the ridgev line or apex'at one side thereof, and are Ystaggered with the pits intersecting the ridge line upon the opposite side, this line-or apex presents a wavy appearance and will itself be roughenedto some extent so as to increase the drawing action of the rolls upon the cane. l

Briefly, the mechanical process for forin-v ing the pits will be that of rolling or yknurling depressions in the rol-l surface. The pits or depressions will be created by forcing in or denting the metal of the roll surface jat points -in regular succession, sothat the elongated depressions are equidistantly 'arranged around the circumferenceof -th'e'rolh preferably in a. multiplicity of annular series, theseannular series boing staggered, as before described, although this is not always necessary. The bottoms ofthe pits or depressions are Vcurved by preference, and, preferably also, the pits are rather shallow' and yet fairly wide, as shown'rin Fig. 3.

l/Vhile I have shown and described a pre! ferred embodiment of my'invention, it will be understoodthat `it is not to be limited toY all the details shown,7but is capable of modification and variation within'tlie spirit of the pendedclaims.

ifhat I clairnis A l. A roll 'for cane-mills or the like, having formed in its surface-a plurality of grooves,` Vand V-shap'ed rid-ges between said grooves,"V and elongated pits formed Ionthelwalls of the! ridges and extendingdownwardly*from the apices thereof, saidpits lbeing in staggeredy relation on opposite sides of the ridge.

21A roll for cane mills or the like, having formed -in its surface a vplurality `of grooves,

and-ridges Ibetween said grooves,` having sharp apices, the walls of said `ridges'having elongated pits formed therein, the walls-of I invention and within the scope of the ap-l g saidridges being unbroken between said' pits, said pits intersecting at their upper ends the apices of tliefridges and' extending downwardly therefrom. I*

3, A roll for-cane mills ortlie'like,having' formed in' its surface a yplurality ofgrooves,

and ridges between said grooves, havingrel atively sharp apices, the walls of sai-d ridges having elongated pits formed therein, the

walls of said ridges being unbroken'between said pits, said pits intersecting at ytheirupper ends the apices of the rid-gestandextending downwardly therefrom, thel longer 'dimen- `rsionof said'pits being substantially perpjendi'cular tothe axisof'the roll.

d. A' roll for cane mills or the like, said roll having upon its surface a plurality of' peripheral grooves and ridges, the ridge lines of said ridges being recessed on the'opposite sideslthereof at staggered points to. give said lines a sinuous shape, the recesses terminating short of the groove bottoms.

5. A roll for cane mills or the like, said roll Ahaving upon its surface a pluralityof peripheral grooves and ridges, the ridge lines of said ridges being recessed on the opposite sides thereof at staggered points to give vsaid lines a sinuous shape.v

6. A roll for cane mills 'or the like, said roll having uponits surface a plurality of peripheral grooves,vand V-shaped ridges havdownwardly and intersecting this line'upon opposite sides at staggered points along its length.

8. A roll for cane millsor the like, having i upon its surface a plurality of alternating grooves and ridges, the walls of said ridges having elongated pits formed therein, the longer dimension of said pits lying substantially at right angles to the axis of the rolls,

and said pits beingv of substantially hourff glass shape, with flaring ends and a restrict-y ed intermediate portion.

. 9. A roll for cane mi upon its .surface a p-luralityv of alternating grooves and ridges, the walls of said ridges having elongated pits formed therein extending from the ridge line downwardly, the

lls orfthe like, having i longer ydimension of said pits lying substanf tially at right angles to the axis of the rolls, Y' Y and said pits being lof substantially hourglass shape, with flaring ends and a re- Y stricted intermediate portion, the upper fiaring ends thereof .intersecting theridge'lin'e4 at staggeredv points upon opposite sides thereof. g

10. A cane roll having Vrshaped ribs with knurled sides, the recesses so formed extending to the ridge line ofthe ribs,the surface :sol

of the ribs between said recesses being preserved in its original form.

11. A sugar cane grindingl roll having.V V-shaped grooves therein, the side walls ,of said grooves being -knurled to form depres' sions serving-as pits to increase the biting action of the roll on thecane, said depressions terminating short of the groove bottoms, the depth of said pits being shallow with respect to the width thereof.

n Vwitness whereof, I havehereunto set l my hand this 5th day of September, 1925. Y DAVID MILNE. 

